Question : A boy goes from home to school at a speed of 30 km/hr and returns back at a speed of 70 km/hr. What is his average speed for the journey?

Option 1: 42 km/hr

Option 2: 48 km/hr

Option 3: 38 km/hr

Option 4: 36 km/hr

Question : A man covers a certain distance by bike. If he covers 25% of the distance at the speed of 25 km/hr, 50% of the distance at the speed of 50 km/hr and the remaining distance at the speed of 12.5 km/hr, find his average speed over the whole journey.

Option 1: 20 km/hr

Option 2: 30 km/hr

Option 3: 25 km/hr

Option 4: 35 km/hr

Question : On a journey across Kolkata, a taxi averages 50 km/hr for 50% of the distance, 40 km/hr for 40% of it and 20 km/hr for the remaining. The average speed (in km/hr) for the whole journey is:

Option 1: 42 km/hr

Option 2: 40 km/hr

Option 3: 35 km/hr

Option 4: 45 km/hr

Question : A car, during its entire journey of 5 hours, travels the first 45 minutes at a certain speed, the next 75 minutes at a speed of 85 km/hr, and the last 3 hours at a speed of 70 km/hr. During its entire journey, the average speed of the car is found to be 73 km/hr. What is the speed (in km/hr) of the car during the first 45 minutes?

Option 1: 65

Option 2: 68

Option 3: 62

Option 4: 72

Question : A person travels a distance of 300 km and then returns to the starting point. The time taken by him for the outward journey is 5 hours more than the time taken for the return journey. If he returns at a speed of 10 km/hr more than the speed of going, what is the average speed (in km/hr) for the entire journey?

Option 1: 20

Option 2: 15

Option 3: 24

Option 4: 30